clean mjit_build_dir.dylib.dSYM directory on macOS

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65602 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Makefile.in

@@ -445,7 +445,7 @@ clean-local::
 	$(Q)$(RM) $(MJIT_MIN_HEADER) $(MJIT_MIN_HEADER:.h=)$(MJIT_HEADER_SUFFIX:%=*).h
 	$(Q)$(RM) $(MJIT_HEADER_INSTALL_DIR)/rb_mjit_min_header-*.h
 	$(Q)$(RM) $(TIMESTAMPDIR)/$(MJIT_HEADER:.h=)$(MJIT_HEADER_SUFFIX).time mjit_config.h
-	$(Q)$(RM) mjit_build_dir.*
+	$(Q)$(RM) -r mjit_build_dir.*
 	-$(Q) $(RMDIRS) $(MJIT_HEADER_INSTALL_DIR) 2> $(NULL) || exit 0
 
 # DTrace static library hacks described here: